Perhaps you should try some spelling variations:
during risk » using risk, during crises, during crisis
wang zhang » wang zheng, wang luhang, zhang zhang
zhang ming » zhang xin
can costa » can cost, can postal, da costa
risk cong » risk coping, risk among, risk along
au costa » _ costa, da costa, de costa
der cost » oder cost, user cost, debt cost

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: wang zhang ming ((((au costa) OR (can costa))) OR (der cost)) during risk cong shu ;~.
• Adding a wildcard symbol may retrieve word variants: wang zhang ming ((((au costa) or (can costa))) or (der cost)) during risk cong shu ;*.